People used to just release all kinds of foreign birds in the US. Most of em didn't last, but there were a few decades (1850s-1880s+) where you could find clusters of semi-established European Skylarks around Cincinnati and Long Island. Wild times. 🦉
This reminds me of when I was wondering if sparrows were finches so I looked it up and learned that sparrows were an invasive species in North America and that they kill other birds